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This article is not about literary canons of influential works of fiction, but about the concept of a canon which defines the world of a particular fictional series or franchise.

Canon, in the context of a fictional universe, comprises those novels, stories, films, etc., that are considered to be genuine or officially sanctioned, and those events, characters, settings, etc., that are considered to have existence within the fictional universe. In order for a setting to appear cohesive, especially in fictions that contain multiple parts, both creators and audiences sometimes find it useful to define what has and has not "actually happened" in that universe.

Material that is considered canon usually comes from the original source or author of the fictional universe, while spin-offs and adaptations to other media are more likely to be non-canon and fan fiction is almost always non-canon.

Contents 1 Origins 2 Nature of fictional canons 3 Examples of fictional canons 3.1 Babylon 5 3.2 Buffyverse 3.3 DC Universe 3.4 Dungeons & Dragons 3.5 Hitchhikers' Guide to the Galaxy 3.6 Marvel Universe 3.7 Middle-earth 3.8 Oz 3.9 Sherlock Holmes 3.10 Star Trek 3.11 Star Wars 3.12 Transformers 4 See also 4.1 Canonical terms in fiction 5 References

The word "canon" originally meant the books which the Catholic Church officially chose to be included in the Bible; by extension, it means the authoritative "holy writ" of a fictional universe. However, the practice of defining a "canon" within a fictional world derived from the concept of a literary canon, a specified collection of works considered to be both representative and the best of a particular form, genre or culture. In that more common use of the word, works forming a canon do not have to bear any relation to each other than their high quality or historical influence.

The use of "canon" to describe the degree to which a work adheres to the standards of its fictional world, appears to have originated amongst devotees of the Sherlock Holmes stories, as a way to distinguish between the original works of Arthur Conan Doyle and adaptations of those works or original works by other writers utilising related characters and settings. However, much of the interest in and controversy over issues of canonicity have appeared in recent decades in the fan followings of films and television shows, such as science fiction franchises Star Wars and Star Trek.

When the body of work nominally set in the same fictional universe becomes large enough, it can happen that new material, such as might be found in spin-off television shows, prequels and books, contradicts earlier material. Such contradictions may be a result of bad research, or an attempt to revise, correct or retcon a perceived error in earlier material. The question is which material to favour and which to ignore when attempting to resolve all the material into a consistent whole. Two simple approaches are the "principle of first mention" in which information in the original work provides a foundation which later material must respect, and the revisionist model in which the latest work always supersedes earlier material. However, the situation can be much more complicated.

Canonicity of fiction is a distinctly modern idea. In addition to the modern concepts of genre fiction and fictional universes, the notion of intellectual property (IP) distinguishes between "official" and "unofficial" sources of stories. However, whereas IP laws are designed to dictate where the revenue generated by a story goes, they do not confer the right to determine canonicity. If a fictional universe has an obvious primary creator then their statements may be held to carry the most authority, but no actual industry label exists for definitively designating published works as canonical, or even for granting any particular individual or organisation the power to dictate what is or is not canonical. Equally, the fact that a majority of fans of a fictional setting view certain things as non-canonical does not oblige everyone to agree.

Canonicity is, then, a largely subjective notion, referring to a shared understanding - if there is one - between the published works in a fictional series and the level of acceptance by a vocal but otherwise accepting wide audience. As such, the word canon can simultaneously refer to the considerations of the publishers of a fictional series as well as what the fanbase chooses to consider as authentic.

Generally, "Expanded Universes" are not considered canonical; by analogy with the idea of a canon of Scripture (see Biblical canon), such stories are considered "apocryphal". However, there are exceptions. In the case of the Star Wars canon, the Expanded Universe is canonical, though open to interpretation in a way which the "gospel" of the films is not. Doctor Who, which began life as a television series but has also been produced in prose, audio and graphical formats, has never had a single author or authority to pronounce on the issue of canon, and its fans run a spectrum between those who consider only the television series canonical and those who consider everything labelled as Doctor Who canonical.

In addition, a story can belong to two overlapping canons. One of the most obvious examples of this is Philip José Farmer's Wold Newton family. Some (but not all) of the adventures of Sherlock Holmes, Tarzan, Doc Savage, etc. are canonical in the Wold Newton setting. This does not mean that the events of Farmer's books are canonical from a Sherlockian perspective. Similarly, fans of Laurie R. King's novels of Sherlock Holmes and Mary Russell consider all the Holmes stories to be canonical in King's setting.

The difference can be even less clear-cut than this. Current Star Trek novels maintain a tight continuity with each other, and avoid contradicting the television series. When a Lost Era novel set between the movies and The Next Generation features a younger version of a character introduced in a Deep Space Nine novel, it's obvious there's some sort of "canonical" novel-setting, even if the TV series is not obliged to conform to it. This is where fanon and canon often collide, especially when a TV series, movie or other officially canonical source contradicts it. An example is the Trek novel Starfleet: Year One, which appeared in print before the TV series Star Trek: Enterprise was announced, but was completely invalidated by the series. Generally, though, in the case of televised fiction, only facts which appear in the as-originally-aired version of a program are considered canonical (including scenes cut from re-runs, but not including such things as deleted scenes and scenes from unaired pilots and other such material that 'leaks out' over the Internet).^{[citation needed]}

Furthermore, the issue is also complicated when the definition of a canon changes well after the fictional universe is established. As an example, in the 1970s and 1980s, there were a number of reference works published by Franz Joseph and FASA Corporation for Star Trek. These books were considered canonical at the time (some even made with the explicit approval of Gene Roddenberry), sanctioned by Paramount Pictures, and were used almost universally by novel and comic book authors, as well as the production staff of the earlier Star Trek movies (information from these manuals appeared as background dialogue in some scenes, and many diagrams were used as computer displays). However, in 1988, as part of the release of Star Trek: The Next Generation, Gene Roddenberry and Paramount Pictures changed their policies regarding canonicity and stripped these books of their canonical status, as the new series quickly made many changes and revelations which openly contradicted earlier canonical books. Thus, a book that would be considered completely canonical in 1985 like The Star Trek Star Fleet Technical Manual, would be considered non-canonical in 1995.

In some fictional universes, interviews and other communications from authors are also considered canonical — like the letters of J. R. R. Tolkien with relation to Middle-earth; also items such as interviews, Internet chat sessions, and websites (e.g., the website of J. K. Rowling in relation to the Harry Potter series). This usually only happens in cases where all works in the universe have the same author.

In almost all cases, fan fiction is not considered canonical, as fan fiction is usually produced by amateurs. Sometimes, however, events or characterizations portrayed in fan fiction can become so influential that they are respected in fiction written by many different authors, and may be mistaken for canonical facts by fans. This is referred to as "fanon". The use of fan fiction to fill gaps or continuity errors in a canon is derisively called "fanwanking," or "fanwank." (The terms "fanon" and "fanwank" can apply to officially-licensed works, as well.) An intentional inversion of the exclusion of fan fiction came in Eric Flint's 1632 universe; in February 2000, fans and other established authors were invited on the Internet forum Baen's Bar to shape the multiverse, and the fan-fic, once vetted, is itself published in the various Grantville Gazettes, themselves under the direct editorial control of Flint and a 1632 editorial board. This is an ongoing process that apparently will continue indefinitely, as the series continues to burgeon in popularity.

Main article: Babylon 5 Novels, novelizations, short stories, and comic books

Unique to the Babylon 5 universe among virtually all other shared universes is the sanctioned canonicity of many of its offshoot novels and comic book stories; nearly all of the Babylon 5 novels and novelizations to date having been based on outlines written directly by J. Michael Straczynski. The later Del Rey books are considered to be more canonical than some of the earlier Dell ones, although – per Straczynski's own remarks – canonical elements exist in every single book published to date; Straczynski's deeper involvement in the novel-publishing program from 1996 onward having ensured a greater level of canonicity within such works.

Main article: Buffyverse canonical issues

The Buffyverse canon consists of the television series Buffy the Vampire Slayer and Angel, as well as the comics The Origin, Fray, Tales of the Vampires, Tales of the Slayers, Buffy the Vampire Slayer Season Eight and the upcoming comic series Angel: After The Fall. All of the tie-in novels and video games, along with most of the comics, are largely considered either non-canon or apocrypha. Some of the comics are written by members of Mutant Enemy writing staff; the canonical status of these materials is still unclear. The 1992 movie is not considered canon. The movie was remade into comic format, titled The Origin and this is considered canon instead.

Main article: DC Universe

Most, but not all, comic books published by DC Comics (and some titles of the Vertigo Comics imprint) take place in a shared world known as the DC Universe. The canon of this world comprises all the post-Crisis comics not stated to be set in an alternate universe, except those specifically contradicted by later stories following Zero Hour (most notably, Batman: Year Two, Batman: Son of the Demon and the Action Comics Weekly strip featuring Captain Marvel). The events may not have occurred exactly as shown, however, owing to the floating timeline.

Appearances of the DC Comics characters in other media are not considered canon; however, the appearance of a Marvel Comics character, Jigsaw, during a Marvel/DC comics publishing crossover, is apparently considered a piece of canon for the adventures of Jean-Paul Valley, aka Azrael, who at one point took up the role of The Batman. Jigsaw was an enemy of Frank Castle, a Marvel Comics character called The Punisher.

Some discrepancies in the DC Universe's canon (continuity errors) are explained by concepts such as Hypertime or through the use of retcons.

Following the events of the second Crisis (2005) and 52 (2006/7), Batman: Son of the Demon has been written back into continuity as evidenced by Batman & Son. Also many Elseworlds stories such as Kingdom Come and Batman: Gotham by Gaslight are now canon, albeit in self-contained alternate universes. All the stories of the WildStorm Universe also exist in this new Multiverse. Stories set in the animated universe adapted from DC Comics stories were also integrated into an alternate reality.

Main article: Dungeons & Dragons campaign settings

The concept of canon plays an important role in the fantasy role-playing game Dungeons & Dragons (D&D). Over the years, a number of campaign settings have been published for D&D, each detailing a world or worlds that provide a setting in which the game can be played. There are two types of canon issues that arise from this situation.

The first issue is intra-setting canon, which deals with the backstory, locations and gameplay dynamics considered to be canon within a specific setting. Because D&D generally falls into the fantasy sub-genre of sword-and-sorcery, canon discrepancies can arise beyond just the typical issues in fiction of history, plot and character. For example, debates regarding canon within a given setting may include such arcana as the source of various magical powers and how they operate within the setting. Theological issues related to the various deities that may exist within the setting occur, as do disagreements regarding the canon cosmology of the setting's universe.

The second type of canon problem that arises in D&D is inter-setting canon, concerned primarily with the relationships between different settings. Many D&D publications have discussed how the various settings are related to each other within the D&D multiverse of various planes of existence, although these relationships are debated or even denied by some fans of the game.

There is no single "official" canon for D&D. From the very beginnings of the game in the 1970s through to the present, the issue of canon has been left up to each individual Dungeon Master, who runs the game session for the other players. The Dungeon Master is free to determine which published materials (adventure modules, novels, sourcebooks, video games, comic books, etc.) are canonical in his or her own campaign, and how the various D&D rules apply to that campaign.

Nevertheless, D&D players often move between games managed by different Dungeon Masters, and many also congregate for gaming tournaments, play in shared living campaigns, or play the game online with different participants than in their normal gaming sessions. In order to achieve even a basic level of continuity among these various game instances, D&D fans must therefore confront the issue of canon.

To achieve the desired level of continuity, various mechanisms are employed to manage D&D "canon." The organizers of gaming tournaments, for example, will often specify which sets of rules and conventions are "in force" for tournament gameplay. Living campaigns may attempt to develop a more comprehensive set of canon materials and sourcebooks, such as the Living Greyhawk Gazetteer for the Living Greyhawk campaign. And for individually-run games, it is common for Dungeon Masters to briefly discuss their own vision of D&D canon with each new player who joins his or her campaign.

Finally, following the emergence of the World Wide Web, a number of websites have arisen that enable players to discuss canon issues and work toward (or reject) canonical norms. These include the website of Wizards of the Coast,^[1] the intellectual property rights holder and publisher for D&D, as well as fan-run sites such as EN World^[2] and Canonfire!.^[3]

Main article: Hitchhikers' Guide to the Galaxy

Every version of the Hitchhiker's Guide to the Galaxy saga, which has been told and retold as a radio series, a book quintet, a text adventure, a live-action television series and a live-action film, flatly contradicts all the others to some extent. This is despite all of this material being written in whole or in part by series creator Douglas Adams. Which version(s) or details are "canonical", then, is largely a matter of personal preference. Adams acknowledged and embraced these inconsistencies in the preface to the first Omnibus edition of the Hitchhiker books, making The Guide a unique example of self-conscious canonicity.

Main article: Marvel Universe

Most, but not all, comic books published by Marvel Comics are set in a shared world known as the Marvel Universe. The canon for this world comprises all the comics not stated to be set in an alternate universe, except those specifically contradicted by later stories. The events may not have occurred exactly as shown, however, owing to the floating timeline (For instance, during the 1960s, Ben Grimm said he had fought in World War II alongside Nick Fury; during the 2000s, Grimm himself considered that the idea of him fighting in World War II was ridiculous, as he would be much older).

Alternate universes in Marvel Comics include, for example, the "Ultimate" line of Marvel comics, which have their own canon independent of the core Marvel universe.

Appearances of the Marvel Comics characters in other media are not considered canon. One of the few exceptions is the video game version of Ultimate Spider-Man, which was made with the intention of being canon.

Main article: Middle-earth canon

Defining the Middle-earth canon is difficult, because many key writings were not published by J. R. R. Tolkien before his death. A considerable number of Tolkien fans do not believe that a canon can be defined at all, preferring to observe the evolution of Tolkien's stories in the many versions and drafts published posthumously in The History of Middle-earth series. Most, however, agree that The Hobbit and The Lord of the Rings are canon, and also include a substantial amount of material published in The Silmarillion, Unfinished Tales, and other posthumous books, as well as information from Tolkien's letters. Works outside of canon include fan fiction (like Nick Perumov's "Ring of Darkness"), art books (except for the collections of Tolkien's own art) and video games; the Lord of the Rings movies by Ralph Bakshi and Peter Jackson are generally considered non-canonical, as well. However, there are a group of Tolkien fans, sometimes called "Continuationists" who consider Roleplaying games, Video Games and the films as canon, unless they contradict with Tolkien's own works.

See also: List of Oz books and List of published Oz Apocrypha

Defining the Land of Oz canon is done in many different ways. The term "canon" for the Oz books was used as early as 1976, in The Oz Scrapbook by David L. Greene and Dick Martin. James Thurber considered only the first two books canon, while some consider only the first book canon and the sequels to be moneymaking exercises. The series was continued by other writers who openly took credit for their work, unlike, for example, the Stratemeyer Syndicate, which has caused many a fan, especially a young fan, to aspire to write their own additions to the canon. While many consider the fourteen L. Frank Baum books to be the true canon, most often, including for Greene and Martin, the canon is referred to as the forty books published by Reilly & Lee, including the fourteen books of Baum (though Reilly & Lee did not publish The Wonderful Wizard of Oz until it fell into the public domain in 1956), the nineteen by Ruth Plumly Thompson, three by longtime illustrator John R. Neill, two by Jack Snow, one by Rachel R. Cosgrove and one by Eloise Jarvis McGraw and Lauren McGraw Wagner. Some include even more books, particularly the additional books by these authors, including one by Baum (another is hard to reconcile with the canon, however), two by Thompson, two by McGraw, one by Cosgrove, and one by illustrator Dick Martin. Some would go further and add the books of Eric Shanower, who illustrated some of these "deuterocanonical" books (as The International Wizard of Oz Club refers to them), particularly since his writing and illustrations are generally both well-received. This is still a matter of much debate and one there is no firm agreement on. For example, The Life and Adventures of Santa Claus is very important to the world-building of the countries that surround Oz and the immortal races that live on the continent, but some have excluded it from canon because Santa Claus is tied to Christianity and others because it is not in accord with what later Oz writers, including Thompson and Robin Hess, have written about Santa Claus.

Main article: Canon of Sherlock Holmes

The Sherlock Holmes canon consists of the stories and novels written by Arthur Conan Doyle. This was decided by the Baker Street Irregulars, a group of Holmes enthusiasts, to distinguish the original stories from the pastiches that followed Holmes' retirement, and is probably the first use of the word in this context. However, certain Conan Doyle items were disregarded for other reasons and additions to the current canon of sixty mysteries has been discussed.

Main article: Star Trek canon

The Star Trek canon consists of the television series Star Trek, Star Trek: The Next Generation, Star Trek: Deep Space Nine, Star Trek: Voyager, Enterprise, and the ten Star Trek movies. Originally, there was little official policy on canon, and Star Trek: The Animated Series and some books like The Star Trek Star Fleet Technical Manual were apparently canonical (and excerpts from them were even used onscreen in the early movies). However, circa 1987, when Star Trek: The Next Generation was debuting, Gene Roddenberry and Paramount Pictures agreed on a new canon policy that made Star Trek: The Animated Series non-canonical, as well as removing the canon status of all technical manuals and novels. Gene Roddenberry further stated that some elements from the films Star Trek V: The Final Frontier and Star Trek VI: The Undiscovered Country were "slightly apocryphal". The writers and production staff of Star Trek have also said in interviews and DVD commentaries that they unofficially struck the Star Trek: Voyager episode "Threshold" from canon, and made no references to the events of that episode after it was made; officially, however, being an onscreen, televised story, it remains canonical.

The canonicity of the various reference books such as The Star Trek Encyclopedia and various companions accompanying the series is still debated. Many consider such reference works to be canon, while others do not; there is currently no clear answer solving this problem. It should be noted that most of the information from the The Star Trek Encyclopedia and The Star Trek Chronology comes directly from the television series and movies, which themselves are canon, and the books were written by people who worked on the production staff, and sometimes were used as internal references. A similar problem exists with trading cards cataloguing information from the series.

Paramount has made a formal comment on its website^[4] about precisely what items are considered canon.

Main article: Star Wars canon

The Star Wars canon is a complex issue, and Lucas Licensing has devised a four-level system called the Holocron continuity database to keep track of the Star Wars canon. The purpose of this database is to chronicle all Star Wars stories, and settle any disputes that may arise within the various productions. The basic rule, however, is that the Star Wars canon comprises the six Star Wars films, along with all officially licensed Star Wars stories not contradicting the films.

The DK Guide to the entire universe utilizes many spin-offs to help describe the six films. Derivative works such as the Star Wars books have aimed to be completely in continuity with each other and with the Star Wars movies.

Main article: Transformers (fiction)

The Transformers canon is unusual, in that there at least four completely distinct Transformers universes; one consisting of the universe introduced in 1984 with the "Generation One" series and extended through the Beast Wars and Transformers: Universe series, the stand-alone Transformers: Robots in Disguise series, the Unicron Trilogy, consisting of the Armada, Energon, and Cybertron lines, and the world featured in the 2007 live-action feature film. Even within these completely disparate universes, there are multiple stories that contradict each other; for instance, under the banner of "Generation One" are several completely different comic book series from four different publishers, the Japanese "Headmasters" series, which openly replaces the events of the U.S. "Rebirth" miniseries, as well as gamebooks, coloring books, audio cassettes, young adult novels, and video games, as well as the toy packaging itself, all of which take various liberties with the same characters. As such, the Transformers universe includes such problems as multiple origin stories for the Constructicons and Optimus Prime.

The general position of Hasbro, owners of the line, is that all Transformer stories are in fact true, and exist in multiple and separate alternate universes, so that the Marvel Comics stories are just as true as the coloring books, which are as true as the animated shows. All of these universes are connected by the existence of Primus and Unicron, who are singularities; they exist in all of the Transformer universes.^[5]

• Whoniverse, an example of a lack of canon
• Cthulhu Mythos, the shared universe for Lovecraftian horror

• Apocrypha (fiction)
• Bible (writing)
• Fanon
• Retcon

This article is missing citations or needs footnotes. Using inline citations helps guard against copyright violations and factual inaccuracies.(July 2007)